[jira] Commented: (THRIFT-223) Validate method should check that enum types are assigned valid values

["Bryan Duxbury (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/THRIFT-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657473#action_12657473 ] 

Bryan Duxbury commented on THRIFT-223:
--------------------------------------

I don't think that we want each struct that uses a given enum to have the value set. I was hoping that the enum class itself would have the set, and the structs would just call out to that set. Does this make sense?

> Validate method should check that enum types are assigned valid values
> ----------------------------------------------------------------------
>
>                 Key: THRIFT-223
>                 URL: https://issues.apache.org/jira/browse/THRIFT-223
>             Project: Thrift
>          Issue Type: Improvement
>          Components: Compiler (Java)
>            Reporter: Nathan Marz
>            Assignee: Piotr Kozikowski
>            Priority: Minor
>         Attachments: thrift-223-v2.patch, thrift-223.patch
>
>
> The validate method generated currently checks that required fields are set. It would be nice if it were to enforce more parts of the schema. One example of this are the values assigned to enum types. For example, if I have this enum:
> enum MyEnum {
>  FOO = 1;
>  BAR = 3;
>  BAZ = 4;
>  BIZ = 5;
> } 
> and this struct:
> struct MyStruct {
>  MyEnum e;
> }
> The validate method would ensure that MyStruct#e is either 1, 3, 4, or 5.
> The naive way of implementing this would be to generate a conditional statement for every value, aka 
> "e==1 || e==3 || e==4 || e==5"
> A better implementation would generate something like:
> "e==1 || (e>=3 && e<=5)"
> Since the common case seems to be having large ranges of contiguous values, this is the difference between having N conditionals execute versus 2.

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